ADC PG-Flex FLC-704 User manual

PG-FLEX
TECHNICAL PRACTICE
SECTION SCP-FLC704-042-03H
Model List CLEI Code
FLC-704 4B N/A
8 CHANNEL
LOOP START/GROUND START POTS
CENTRAL TERMINAL CHANNEL UNIT

SCP-FLC704-042-03H
January 6, 2003 FLC-704 List 4B
Revision History of This Practice
©Copyright 2003 ADC DSL Systems, Inc. All Rights Reserved.
ADC is a registered trademark of ADC Technologies, Inc. PG-Flex is a registered trademark of ADC DSL Systems, Inc. No right,
license, or interest to such trademarks is granted hereunder, and you agree that you shall assert no such right, license, or interest
with respect to such trademarks. Other product names mentioned in this document are used for identification purposes only and
may be trademarks or registered trademarks of their respective companies.
Information contained in this document is company private to ADC DSL Systems, Inc., and shall not be modified, used, copied,
reproduced or disclosed in whole or in part without the written consent of ADC.
Contents herein are current as of the date of publication. ADC reserves the right to change specifications at any time without notice.
Information furnished by ADC is believed to be accurate and reliable. In no event shall ADC be liable for any damages resulting
from the loss of data, loss of use, or loss of profits and ADC further disclaims any and all liability for indirect, incidental, special,
consequential or other similar damages. This disclaimer of liability applies to all products, publications and services during and
after the warranty period.
Revision Release Date Revisions Made
01 October 22, 1999 Initial Release
02 January 10, 2002 Release to rebrand document to comply with ADC standards
03 January 6, 2003 Updated Product Support Information

SCP-FLC704-042-03H Using This Practice
FLC-704 List 4B January 6, 2003
USING THIS PRACTICE
Three types of messages, identified by icons, appear in the text.
INSPECTING YOUR SHIPMENT
Upon receipt of the equipment:
•Unpack each container and visually inspect the contents for signs of damage. If the equipment has been
damaged in transit, immediately report the extent of damage to the transportation company and to ADC.
Order replacement equipment, if necessary.
•Check the packing list to ensure complete and accurate shipment of each listed item. If the shipment is short
or irregular, contact ADC as described in “Returns” on page 11. If you must store the equipment for a
prolonged period, store the equipment in its original container.
Notes indicate information about special circumstances.
Cautions indicate the possibility of equipment damage or the possibility of personal injury.
Electrostatic Discharge (ESD) susceptibility symbols indicate that a device or assembly is
susceptible to damage from electrostatic discharge.You must wear an antistatic wrist strap
connected to the appropriate ground connection prior to performing installation procedures.
You must also observe normal ESD precautions when handling electronic equipment. Do not
hold electronic plugs by their edges. Do not touch components or circuitry.

Inspecting Your Shipment SCP-FLC704-042-03H
January 6, 2003 FLC-704 List 4B

SCP-FLC704-042-03H
FLC-704 List 4B January 6, 2003 i
TABLE OF CONTENTS
Overview ____________________________________________________________________________ 1
Description .........................................................................................................................................1
Front Panel .........................................................................................................................................2
Specifications .....................................................................................................................................3
Operational Capabilities.....................................................................................................................4
Circuit Operation................................................................................................................................4
Loop Start Operation ...........................................................................................................4
On-hook (Idle) Condition......................................................................................4
Subscriber Initiated Outgoing Call........................................................................5
Subscriber Receives Incoming Call ......................................................................5
Busy Condition......................................................................................................5
Ground Start Operation .......................................................................................................6
Idle Condition........................................................................................................6
Subscriber Initiates Outgoing Call ........................................................................6
Subscriber Receives Incoming Call ......................................................................8
Busy Condition......................................................................................................8
CLASS Features ..................................................................................................................8
Forward Disconnect.............................................................................................................8
Installation and Turn-up _______________________________________________________________ 9
Installing.............................................................................................................................................9
Provisioning .......................................................................................................................................9
Verify Installation ..............................................................................................................................9
Troubleshooting _____________________________________________________________________ 10
Product Support _____________________________________________________________________ 11
Technical Support ............................................................................................................................11
Limited Warranty.............................................................................................................................11
Returns .............................................................................................................................................11
FCC Class A Compliance ................................................................................................................13
Modifications ...................................................................................................................................13
Acronyms___________________________________________________________________________ 14

SCP-FLC704-042-03H
ii January 6, 2003 FLC-704 List 4B

SCP-FLC704-042-03H
FLC-704 List 4B January 6, 2003 iii
LIST OF FIGURES
1. FLC-704 Front Panel.......................................................................................................................................2

SCP-FLC704-042-03H
iv January 6, 2003 FLC-704 List 4B

SCP-FLC704-042-03H
FLC-704 List 4B January 6, 2003 v
LIST OF TABLES
1. FLC-704 Front Panel LEDs and Labels ..........................................................................................................2
2. Circuit Interactions for an Idle Condition (Loop Start)....................................................................................4
3. Circuit Interactions When a Subscriber Initiates an Outgoing Call (Loop Start)............................................5
4. Circuit Interactions When a Subscriber Receives an Incoming Call (Loop Start)..........................................5
5. Circuit Interactions for a Busy Condition (Loop Start)...................................................................................6
6. Circuit Interactions for an Idle Condition (Ground Start) ...............................................................................6
7. Circuit Conditions When a Subscriber Initiates an Outgoing Call (Ground Start) .........................................6
8. Circuit Conditions When a Subscriber Receives an Incoming Call (Ground Start) .......................................8
9. Circuit Conditions for a Busy Condition (Ground Start) ................................................................................8
10. FLC-704 CU Troubleshooting ......................................................................................................................10

SCP-FLC704-042-03H
vi January 6, 2003 FLC-704 List 4B

SCP-FRC754-042-03H Description
FLC-704 List 4B January 6, 2003 1
OVERVIEW
The ADC®PG-Flex®FLC-704 List 4B provides eight loop start or ground start channel interfaces for POTS
between a PG-Flex COT Shelf and the Central Office (CO) switch using A-Law pulse code modulation (PCM)
encoding. In addition, the FLC-704 provides metallic access to the subscriber line connection through an optional
metallic bypass pair for subscriber circuit testing.
DESCRIPTION
Features of the PG-Flex FLC-704 are:
•eight LS/GS POTS subscriber interfaces
•64 kbps A-Law PCM encoding
•meter tones (12 kHz, 16 kHz)
•front panel ACTIVE LEDs indicate on-hook (idle), ringing, metallic access, and off-hook condition for each
channel
•front panel FAULT LED indicator simplifies troubleshooting
•Pair Gain Test Controller (PGTC) compatibility
•Custom Local Area Signaling Services (CLASS) support (such as, caller ID)
•line-side answer supervision support (reverse battery)
•forward disconnect
•distinctive ringing
•metallic access for subscriber circuit testing
•repeat of loop off-hook, ground start seizure, and Ring-Trip conditions to the CO switch

Front Panel SCP-FRC754-042-03H
2 January 6, 2003 FLC-704 List 4B
FRONT PANEL
The FLC-704 front panel (Figure 1) includes green status LEDs for each line indicating on-hook (idle), ringing,
and off-hook conditions, as well as a red LED indicating a fault condition on the CU. Table 1 lists the different
states and indications for the FLC-704 CU front panel LEDs.
Figure 1. FLC-704 Front Panel
Table 1. FLC-704 Front Panel LEDs and Labels
LED and Label Function
ACTIVE
(1 through 8)
Solid green: Channel is off-hook.
Fast flashing green: Channel is in test access mode.
Slow flashing green: LED follows the ring signal.
Off: Channel is on-hook (idle).
FAULT
Red: Fault detected by the unit. Refer to Table 10 on page 10 for troubleshooting procedures.
Off: No faults detected.
Warranty
Control Number
Label
Indicates the beginning year and month of the equipment warranty. Also indicates the unit revision number.
For example, a warranty control number of 71203 indicates a warranty beginning 1997 (7), in December
(12), and the revision is 03.
Bar Code Label Contains the serial number and part number of the equipment in both bar code and text formats.
Status LEDs
Fault LED
PG-FLEX
FLC 704
LIST
FAULT
4
A
C
T
I
V
E
1
2
3
4
5
6
7
8
B

SCP-FRC754-042-03H Specifications
FLC-704 List 4B January 6, 2003 3
SPECIFICATIONS
Electrical Characteristics
Analog Impedance 600 Ω
Loop Resistance 100 Ω, (CO switch to COT) maximum
End-to-End Loss –2.5 dB ±1.0 dB at 100 Hz
Ring-Ground Resistance 500 Ω
Channel Signature Loop Start Lines Ground Start Lines
Tip-Ring (open) 23.75 kΩ, 1%
Tip-Ground 162 kΩ, 1% 162 kΩ, 1%
Ring-Ground 226 kΩ, 1% 226 kΩ, 1%
Environmental
Operating Elevation –200 ft. to 13,000 ft. (–60 m to 4000 m)
Temperature –40° F to +150° F (–40° C to +65° C)
Humidity 5% to 95% (noncondensing)
Physical
Weight 0.8 lb. (0.4 kg.)
Height 6.75 in. (17.1 cm.)
Width 1.0 in. (2.5 cm.)
Depth 10.5 in. (26.7 cm.)

Operational Capabilities SCP-FRC754-042-03H
4 January 6, 2003 FLC-704 List 4B
OPERATIONAL CAPABILITIES
The FLC-704 List 1A CU provides eight loop start or ground start POTS interfaces to the CO switch. The unit
performs the interface function between the analog POTS circuit and the internal digital pulse coded modulation
(PCM) bus. In addition, each CU:
•detects forward battery
•detects ringing voltage
•detects reverse battery
•detects Tip ground and Tip open
•detects 12 kHz or 16 kHz meter tone
•detects a subscriber test access signal
•provides loop closure
•provides grounded ring lead
•converts analog signals to and from 64 kbps A-Law PCM digital format
CIRCUIT OPERATION
The following paragraphs define the FLC-704 circuit operation when using loop start for subscriber lines or
ground start for PBX lines. Each FLC-704 circuit has an associated LED that indicates when the line is off-hook,
on-hook (idle), ringing, or under test (see Table 1 on page 2 for front panel LED definitions).
Loop Start Operation
The following section summarizes the loop start sequences for on-hook (idle), subscriber inititated outgoing calls,
subscriber received incoming calls, and busy conditions.
On-hook (Idle) Condition
Loop start idle condition is a Ring-lead negative and Tip-lead positive from the CO with the same condition out
of the RT toward the subscriber (see Table 2 for circuit interactions).
Table 2. Circuit Interactions for an Idle Condition (Loop Start)
Operation CO Switch FLC-704 COCU FRC-754 RTCU Subscriber
Circuit Idle No ringing ⇒No ringing ⇒
⇐On-hook ⇐On-hook

SCP-FRC754-042-03H Circuit Operation
FLC-704 List 4B January 6, 2003 5
Subscriber Initiated Outgoing Call
The following occurs when the calling line goes off-hook (see Table 3 on page 5 for circuit interactions):
•loop current flows and is detected by the FLC-704 CU
•FLC-704 receives an off-hook signal from the RT
•FLC-704 generates an off-hook condition to the CO switch
•CO sends dial tone
•FRC-754 passes a dial pulse or Dual Tone Multi Frequency (DTMF) signal through the FLC-704 from the
subscriber and forwards these to the CO.
Subscriber Receives Incoming Call
The following occurs for an incoming call (see Table 4 for circuit interactions):
•FLC-704 detects a ringing signal from the CO
•FLC-704 signals the FRC-754 which then connects ringing to the subscriber
•subscriber line goes off-hook and the FRC-754, through the FLC-704, provides an off-hook condition to the
CO switch
Busy Condition
Loop start busy condition at the RT is a Ring lead negative and a Tip lead positive with loop current flowing. The
same conditions occurs at the CO (see Table 5 for circuit interactions).
Table 3. Circuit Interactions When a Subscriber Initiates an Outgoing Call (Loop Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber
CO Idle No ringing ⇒No ringing ⇒
Subscriber goes
off-hook
⇐Off-hook ⇐Off-hook
CO returns dialtone Dialtone ⇒Dialtone ⇒
Subscriber Dials ⇐DP or DTMF ⇐DP or DTMF
Table 4. Circuit Interactions When a Subscriber Receives an Incoming Call (Loop Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber
Subscriber Idle ⇐On-hook ⇐On-hook
CO generates
ringing
Ringing ⇒Ringing ⇒
Subscriber goes
off-hook
⇐Off-hook ⇐Off-hook
Ring trip No ringing ⇒No ringing ⇒

Circuit Operation SCP-FRC754-042-03H
6 January 6, 2003 FLC-704 List 4B
Ground Start Operation
The following section summarizes the ground start sequences for on-hook (idle), subscriber inititated outgoing
calls, subscriber received incoming calls, and busy conditions.
Idle Condition
Ground start idle condition is a Tip-lead open and Ring-lead negative from the CO and Tip lead open and
Ring-lead negative at the RT (see Table 6 for circuit interactions).
Subscriber Initiates Outgoing Call
The following occurs when a PBX requests service for an outgoing call (see Table 7 for circuit interactions):
•PBX grounds Ring lead at the RT
•FRC-754 signals the FLC-704
•FLC-704 operates a Ring-ground relay that requests dial tone from the CO (this makes the circuit busy, or
seizes it, for outgoing calls, and blocks any incoming calls prior to the PBX dialing (that is, it prevents glare
where incoming and outgoing calls may occur simultaneously on the same line). Glare occurs when both ends
of a telephone line or trunk are seized at the same time.
•CO sends dial tone and grounds the Tip to signal the PBX to begin dialing
•FLC-704 detects Tip-ground, closes the loop between Tip and Ring, and signals the FRC-754 to send Tip
ground to the PBX
•PBX removes the original Ring-ground condition and completes the loop (Tip and Ring)
Table 5. Circuit Interactions for a Busy Condition (Loop Start)
Operation CO Switch FLC-704
COCU
FRC-754
RTCU Subscriber
Circuit busy No ringing ⇒No ringing ⇒
⇐Off-hook ⇐Off-hook
Table 6. Circuit Interactions for an Idle Condition (Ground Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber
Circuit Idle Tip - no
ground
No ringing
⇒Tip - no ground
No ringing
⇒
⇐Ring - no ground
On-hook
⇐Ring - no ground
On-hook
Table 7. Circuit Conditions When a Subscriber Initiates an Outgoing Call (Ground Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber
CO Idle Tip - No
ground
No ringing
⇒Tip - No ground
No ringing
⇒

SCP-FRC754-042-03H Circuit Operation
FLC-704 List 4B January 6, 2003 7
Subscriber requests
dialtone
⇐Ring - ground
On-hook
⇐Ring - ground
On-hook
CO returns dialtone Tip - ground
Dialtone
⇒Tip - ground
Dialtone
⇒
Subscriber Dials ⇐Ring - no ground
Off-hook
DP or DTMF
⇐Ring - no ground
Off-hook
DP or DTMF
Table 7. Circuit Conditions When a Subscriber Initiates an Outgoing Call (Ground Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber

Circuit Operation SCP-FRC754-042-03H
8 January 6, 2003 FLC-704 List 4B
Subscriber Receives Incoming Call
The following occurs for an incoming call (see Table 8 for interactions):
•FLC-704 detects a ringing signal from the CO, along with Tip-ground
•FLC-704 signals the FRC-754 to connect Tip-ground and ringing to the PBX
•PBX goes off-hook and the FRC-754, through the FLC-704, closes the loop between Tip and Ring, the CO
disconnects ringing and establishes an audio path.
Busy Condition
Ground start busy condition at the RT is a Ring lead negative and a Tip lead positive with loop current flowing.
The same conditions occurs at the CO (see Table 9 for circuit interactions).
CLASS Features
PG-Flex supports on-hook transmission of analog signals. When Call ID (a CLASS feature) is activated, the CO
generates analog signalling toward the PBX between the first and second bursts of the ringing signal.
Forward Disconnect
The forward-disconnect function releases a called line that was left on hold or an answering set that requires a loop
open to be able to turn off.
Table 8. Circuit Conditions When a Subscriber Receives an Incoming Call (Ground Start)
Operation CO Switch FLC-704 COCU FRC-754
RTCU Subscriber
Subscriber Idle ⇐Ring - no ground
On-hook
⇐Ring - no ground
On-hook
CO seizes loop Tip - ground
No Ringing
⇒Tip - ground
No Ringing
⇒
CO generates
ringing
Tip -ground
Ringing
⇒Tip -ground
Ringing
⇒
Subscriber goes
off-hook
⇐Ring - no ground
Off-hook
⇐Ring - no ground
Off-hook
Ring trip Tip - ground
No ringing
⇒Tip - ground
No ringing
⇒
Table 9. Circuit Conditions for a Busy Condition (Ground Start)
Operation CO Switch FLC-704 COCU FRL-754
RTCU Subscriber
Circuit busy Tip - ground
No ringing
⇒Tip - ground
No ringing
⇒
⇐Ring - no ground
Off-hook
⇐Ring - no ground
Off-hook

SCP-FRC754-042-03H Installing
FLC-704 List 4B January 6, 2003 9
INSTALLATION AND TURN-UP
INSTALLING
1Insert each FLC-704 CU into the COT Shelf and observe that all LEDs:
•turn ON for approximately 2 seconds
•scan from top to bottom
•flash all ON, then OFF
If the LEDs do not follow the above sequence, see Table 10.
2Verify that the front panel indicators ACTIVE 1 through ACTIVE 8 and FAULT LEDs are all off when the
PG-Flex system has powered up, established HDSL synchronized communications, and no calls are in
progress.
PROVISIONING
Provision the FLC-704 using the appropriate line unit technical practice. For each channel provisioned, select loop
start or ground start.
VERIFY INSTALLATION
After the PG-Flex system is powered up and HDSL communication is synchronized:
1Verify that the front panel ACTIVE indicators are all OFF and the FAULT indicator is OFF (no calls are in
progress).
2Test the loop start circuits, as follows:
•Place an outgoing call for each subscriber circuit provisioned, and verify that the ACTIVE LED tracks
the progress of the call (refer to Table 1 on page 2 for front panel indications).
•Place an incoming call to each subscriber circuit provisioned, and verify that the ACTIVE LED tracks
the progress of the call (refer to Table 1 on page 2 for front panel indications).
3Test the ground start circuits, as follows:
•Place an outgoing call for each subscriber circuit provisioned, and verify that the ACTIVE LED tracks
the progress of the call (refer to Table 1 on page 2 for front panel indications).
•Place an incoming call to each subscriber circuit provisioned, and verify that the ACTIVE LED tracks
the progress of the call (refer to Table 1 on page 2 for front panel indications).
To activate the ground start feature, use a List 3 of higher PG-Flex CO and RTLUs.

Verify Installation SCP-FRC754-042-03H
10 January 6, 2003 FLC-704 List 4B
TROUBLESHOOTING
Table 10. FLC-704 CU Troubleshooting
Indication Problem Action
FAULT
LED On
The FLC-704 processor
has detected a fault.
Remove and reinsert the CU. If the FAULT LED does not extinguish, replace the CU.
Troubleshooting based on customer-originated trouble reports
No Dial
tone, Can
not Dial
•faulty RT or COT
CU
•facility short/open
•CO switch problem
•Tip/Ring reversed at
CO
1Lift the subscriber pair at the network interface. If dial tone is present and you can
place a call, refer the problem to the customer per local practice.
2If you can not hear a dial tone or can not place a call at the network interface (with
the subscriber pair lifted), check for dial tone at the RT. If a dial tone is present, check
the pair between the RT and the network interface. If no dial tone is present, replace
the RT CU.
3If the problem still exists, re-insert the original RT CU and replace the COT CU. Test
for operation.
4If the problem still exists, refer the problem to the CO switch.
Phone Does
not Ring
•high-resistance
subscriber line short
•faulty RT or CO CU
•loop length too long
1Lift the subscriber pair at the network interface. If ringing is present, refer the
problem to the customer per local practice.
2If ringing is not present, check for ringing at the RT. If ringing is present, check the
pair between the RT and the network interface. If no ringing is present, replace the
RT CU. If ringing is still not present, check a circuit on another CU. If ringing is still
not present, replace the LU.
3If ringing is still not present at the RT, re-insert the original CU and LU. Test for
ringing at the COT.
4Test for ringing into the COT from the CO switch. If no ringing is present, refer the
trouble to the CO switch. If ringing is present, replace the COT CU. Test again for
ringing at the network interface. If ringing is still not present, contact ADC technical
assistance per Product Support.
5Verify the resistance of the copper loop between the RT Enclosure and the network
interface is less than 530 Ω.
Phone does
not stop
ringing
•faulty subscriber
instrument
•faulty RT CU
•loop length too long
1Test for ring trip at the network interface. If the ringing is tripped, refer the trouble to
the customer per local practice.
2If the ringing is not tripped, test for tripping at the RT. If ring trip does occur, check
the loop for excessive length. If ring trip does not occur, replace the RT CCU. If ring
trip still does not occur, contact ADC technical assistance per Product Support.
3Verify the resistance of the copper loop between the RT Enclosure and the network
interface is less than 530 Ω.
Can not
Hear, Can
not Be
Heard
•subscriber problem
•faulty RT or COT
CU
1Lift the subscriber line at the network interface and check the signal level. If correct,
refer trouble to the customer per local practice.
2If the level is too low, check the level at the RT. If the level is correct at the RT, check
the pair between the RT and the network interface. If the level is too low at the RT,
replace the RT CU.
3If the level is still too low, re-insert the original RT CU.
4Check the level at the COT coming from the CO switch. If it is correct, replace the
COT CU. If it is not correct, refer the problem to the CO regarding the switch.
5If the level is still not correct, re-insert the original COT CU. Contact ADC technical
assistance per Product Support.